Bob,
Here are a couple that show the intake to the pump.
The second one shows the all important small vent line (brownish red)
from the front of the engine back to the top of the pressure can.

Paul Lamar

Thanks Paul,

The vent line was another question I had coming up.  I sort of thought
it should go to some high point in the system.

Does the pressure can provide an air volume to allow for expansion, or
is it connected to an overflow container at ambient pressure, or will it
work either way?

Bob White

http://www.bob-white.com
N93BD - Rotary Powered BD-4

There appears to be two popular systems. One; you can seal the whole
thing up, fill the pressure tank half way and let the pressure build
up to a high value say up to 50 psi. I expect that not to work too well 
in our applications as we don't have a lot of room over the block for
air in the pressure can.

The second system is use a 25 psi pressure cap. Fill the system all the way
to the top and use an overflow can. If and when the cap pops off coolant 
is transferred to the overflow can. When the engine cools off and the 
coolant contracts the second one way valve in the pressure cap opens 
and will allow coolant to flow back into the system from the over flow can.

Up until recently that has been universally used.

Paul Lamar
 
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